Hydraulic press



J; v. GIESLER HYDRAULIC PRESS Oct. 15, 1940.

8 Sheets-Sheet 1 Filed March 30, 1938 4. v. GIESLER HYDRAULIC PRESS I Filed March 30, 1938 a Sheets-Shed 2 Oct. 15, 1940. J. v. GIESLER HYDRAULIC PRESS Filed March so, 1938 8 Sheets -Sheef 5 Oct. 15, 1940. J. v. GIESLER HYDRAULIC PRESS Eild March so, 1958 a Sheets-Sheet 4 Oct. 15, 1940.

. l. V. GIESLER HYDRAULIC PRESS Filed March 30, 1938 8 Sheets-Sheet 5 Oct. 15, 1940. 2,217,799

HYDRAULI C PRES S Filed March so, 1938 a Sheets-Sheet a Oct J. v. GIESLER 2,217,799

HYDRAULIC PRESS Filed March 30, 1958 8 Sheets-Sheet 7 Oct. 15, 1940- J. v. GIESLER HYDRAULIC PRESS Filed March so, 1958 a Sheets-Sheet 5 m I m 1 Patented Oct. 15, 1940 UNITED STATES PATENT OFFICE Application March 30, 1938, Serial No. 199,056

29 Claims.

l pressure until bulges form in the tube between plates and thereafter forcing the forming plates toward each other to form corrugations in the tube between plates. In these devices many pf the steps in the process of forming the expansible and contractible vessels have been performed manually resulting in low production rates and have introduced difliculties arising from the human factor of the operators.

The present invention obviates these prior difficulties though using the broad idea of forming expansible and contractible metallic vessels by spacing equidistantly a plurality of forming plates along a metallic tube, expanding the tube by hydraulic pressure forming bulges in the tube 25 between the forming plates, and thereafter forcing the forming plates together to form the desired corrugations in the tube by providing automatic operation in the sequence of its functions thus producing a uniform product at greatly increased rates. In the present invention the operator places the metallic tube to be formed into the expansible and contractible vessel within the forming plates. In looking the forming plates about the tube the operator automatically actuates suitable means for advancing other suitable means for closing the open end or ends of the tube. Thereafter hydraulic pressure is automatically exerted within the tube to form bulges in the tube between the forming plates. 40 When the hydraulic pressure reaches a predetermined value it is thereafter automatically maintained at this pressure and at the same time suitable means are automatically energized to remove spacers from between the forming 45 plates. Upon removal of these spacers means are actuated automatically to force the plates toward each other to form the desired corrugations in the tube between the plates. When the plates reach a predetermined relationship 50 the compressing force is automatically terminated, the hydraulic pressure within the now formed corrugated vessel automatically removed, and the end sealing means automatically returned to their original positions, and the operator then manually removes the formed vessel from the forming plates, manually returns the spacers between the several forming plates and places another tube within the forming plates-to start another forming cycle.

It is accordingly an object of the present invention to provide a novel hydraulic press for forming expansible and contractible corrugated metallic vessels in which a metallic tube is subjected to internal pressure to expand it between forming plates which are thereafter forced together to form the corrugated vessel.

. It is another object of this invention to provide a novel hydraulic press in which the several steps of forming the expansible and contractible vessel are automatically performed at the proper time.

Another object of this invention is to provide a novel hydraulic press in which novel means are automatically actuated when the forming plates are locked together to automatically seal the open end or ends of the tube.

Another object of this invention is to provide a novel hydraulic press in which novel means, are used to seal the end or ends of the tube.

Another object of this invention is to provide a novel hydraulic press in which novel means are automatically actuated to introduce hydraulic pressure within the tube when the end or ends of the tube are sealed.

Another object of this invention is to provide a novel hydraulic press in which novel means are provided for maintaining the hydraulic pressure within the tube at ,a predetermined value.

Another object of this invention is to provide a novel hydraulic press in which novel means are provided for generating the hydraulic pressure for use within the tube.

Another object of this invention is to provide a novel hydraulic press in which novel means are automatically actuated when the hydraulic pressure within the tube has reached a predetermined value to remove the spacers from between the forming plates.

Another object of this invention is to provide a novel hydraulic press in which novel means are provided to force the forming plates together which means are automatically actuated as soon as the spacers have been removed from between the forming plates.

Another object of this invention is to provide a novel hydraulic press in which novel means are automatically actuated when the forming plates have been forced together a predetermined amount to release the pressure forcing the forming plates together.

Another object of this invention is to proare provided for automatically reducing the hydraulic pressure within the formed vessel as soon as the forming plates have been forced together a predetermined amount.

Another object of this invention is to provide a novel hydraulic press in which novel means are provided for automatically removing the end sealing means as soon as the forming plates have been forced together a predetermined amount.

Another object of this invention is to provide a novel hydraulic press in which the steps of forming the expansible and contractible corrugated metallic vessel are automatically carried out in proper sequence by hydraulic pressure.

Another object of this invention is to provide a novel hydraulic press in which novel means are provided for locking the forming plates together.

Another object of this invention is to provide a novel hydraulic press in which novel means are provided for manually interposing the spacers between the forming plates.

Another object of this invention is to provide a novel hydraulic press in which novel means are provided for mounting the forming plates.

Another object of this invention isto provide a novel hydraulic press in which novel means are provided for mounting the forming plates to allow their ready removal for repair or replacement.

Another object of this invention is to provide a novel hydraulic press in which novel means are provided for adjusting the'relative position of the spacers.

Another object of this invention is to provide a novel hydraulic press in which novel means are provided for mounting the spacers to allow their ready removal for repair or replacement.

Other and further objects of this invention will appear as the description thereof proceeds.

With these objects in view an illustrative embodiment of the novel hydraulic press of the -in Fig. 1 but including the hydraulic reservoir not shown in Fig. 1;

Fig. 4 is an enlarged view of a. portion of Fig. 1 showing in more detail the forming plates, their novel locking means, the novel end sealing means, and the ram for forcing the forming plates together;

Fig. 5 is an enlarged view of a portion of Fig. 1 as seen from the top showing in more detail the novel cradle carrying the forming plates, the

novel cradle lock, and the novel spacer support;-

Fig. 6 is a more detailed showing of the novel spacer actuating means shown in Fig. 1 as seen from the left in Fig. 1;

Fig. '7 is an exploded and enlarged view of the pilot valve shown in Fig. 5;

Fig. 8 is an enlarged view of a pair of cooperating forming plates as shown. in Fig. 1 showing in more detail the novel locking means and the positioning of the springs between the forming plates;

. Fig. 9 is a cross section of a portion of Fig. 1 as seen-from the right in Fig. 1 showing in more detail the novel end plate, novel plate locking means and novel cradle locking means;

Fig. 10 is a cross section on the line i0--l0 in Fig. 8 showing the interlocking construction of each pair of forming plates at their pivot;

Fig. 11 is a partial cross section as viewed from. the top in Fig, 1 of any two adjacent forming plates showing in full lines the position of one of the springs between adjacent forming plates in expanded position and showing in dotted lines the position of the spring in contracted position;

Fig. 12 is a side view in more detail of the novel cradle locking means shown in Fig. 1 here shown inlocked position;

Fig. 13 is a vertical sectional view along the axis of the embodiment of the present invention shown in Fig. 1 showing the tube end sealing means, the tube in position in the forming plates and the relative position of the end plate and ram at the beginning of the cycle but before interposing the spacers;

Fig. 14 is an enlarged andmore detailed view of a portion of Fig. 13 showing the spacers in position between the forming plates;

Fig. 15 is a sectional view of the tube in the forming plates after hydraulic pressure has formed bulges in the tube between the forming plates;

Fig. 16 is a sectional view of the tube in the forming plates after the forming plates have been forced together;

Fig. 17 and Fig. 17a are fragmentary side views of the tube clamping members used with one embodiment of the novel tube end sealing means of the present invention;

Fig. 18 is an end view of the embodiment of the novel tube end sealing means as seen from the right in Fig. 17;

Fig. 19 is a vertical section of the pressure booster used with the embodiment of the present invention'shown, in Fig. 1;

Fig. 20 is a sectional view in more detail of the embodiment of the tube end sealing means shown in Fig. 1;

Fig. 21 is an enlarged view of a portion of Fig. 20;

Fig. 22 is a sectional view of another embodiment of my novel tube end sealing means; and

Fig. 23 is a view of the embodiment of the tube end sealing means of Fig. 22 showing the tube sealed therein.

In the several figures, in which like reference characters indicate similar parts, and more particularly with reference to Figs. 1, 2, 3, 4 and 5,

II is any suitable machine bed longitudinally slotted at l2 for mounting the several parts of the device and supported by suitable legs l3. Mounted at one end of bed II are brackets l4 and I5 between which is carrieda ram piston and cylinder l6, bolts i1 acting to hold the assembly together. Fluid under pressure is admitted to one side of the piston in cylinder is through hand-adjusted valve l8 and to the other side of the piston through hand-adjusted valve i9. Carried by the piston in cylinder 16 and projecting through a suitable stufllng box 20 is the ram shaft 2i terminating in a ram head 22 which is threaded on shaft 2| to allowlongitudinal adjustment along the length of shaft 2|.

Carried by bed ll adjacent ram head 22 is about pivot 58.

cradle base 23 having uprights 24 and 25 secured thereto and carrying a top member 28 (see Fig. 4) sealing assembly to partially pass therethrough and upright 25 is suitably cut away to allow ram shaft 2| to pass therethrough. Carried between uprights 24 and 25 is guide rod 28 upon which is slidably mounted any suitable number of'nonpivoted forming plates 29 and pivoted forming plates 36, rod 28 also carrying a stop sleeve 38 to limit the expansive movement of plates 29 and 36.

Also carried between uprights 24 and 25 is a guide rod 3| upon which said plates 29 are also designed to slide and upon which is mounted a stop sleeve 32 to limit the expansive movement of plates 29. Pivotally mounted on rod 28 are cradle end members 33 and 34 carrying a top member 35 (Fig. 9) and supporting between them on guide rod 31 theforming-plates 36, guide rod 31 being carried by said cradle members 33 and 34 and having mounted thereon a stop sleeve 38 to limit the expansive movement of plates 36. Plates 29 and 36 are arranged in cooperating pairs each pair of plates being interlocked at their pivot point about rod 28 as shown in Fig. 10 and being provided with a bearing bushing 39 as shown in Fig. 8 in sliding engagement with rod 28. Each of plates 29 and 36 are semicircularly recessed at 48 and 4| respectively (Fig. 8) to form a circular die when each pair of plates is locked together, plates 29 and 38 being cut away at M and 42 respectively to receive the bends of metal of the finished product as will be more fully described hereafter. Plates 29 and 36 are also recessed on both sides at 43 and 44 respectively to receive springs 45, springs 45 having outturned ends 46 (Fig. 11) to engage slots 41 and operating to force the several pairs of plates apart. Each of plates 29 has formed thereon an upwardly extending tongue 48 on which is pivotally mounted at 49 a latch 58 designed to eneach of plates 36 to lock each pair of plates together. Each latch 58 carries a tongue 52 which is bored at 53 to slidably receive a release rod 54. Release rod 54 is carried at each end by. links 55 secured to a rocking shaft 56 which extends through the cradle latch member 51 (Fig. 4). Cradle latch member 51 is pivotally mounted at 58 (Fig. 9) on brackets 59 carried by top member 26.

Cradle latch member 51 terminates at one extremity in downwardly turned latch fingers 68 carrying between them a lock bar 6| and is recessed at 62 at its opposite extremity to receive a gear 63 rotatable about pivot 58 with cradle latch member 51. Cradle latch member 51 is provided with a stop 64' to limit its upward motion Suitably secured to top member 26 are rearwardly extending arms 64 between which is rotatably mounted a shaft carrying thereon a gear 66 in engagement with gear 63 and having mounted thereon at opposite extremities cranks 61 carrying pins 68. Attached to rocking bar 56 and engaging pins 68 are springs 68.

Pivotally mounted on an extension 18 of cradle base 23, at at 1|, is cradle latch lever 12 which passes through a slot in an extension 13 of top member 35 and terminates in a hand grip 14. Lever 12 is slotted at 15 to slidably receive the pin 16' of the latch bar 11 terminating in fingers 18 and 19. Latch bar 11 is pivotally mounted, as at 88, on upturned flanges 8| of extension 13. ver 12 is provided with a shoulder 82 to engage Upright 24 is cut away at 21 to allow the end therefrom is track 84 upon which is mounted a slide 85. Slide 85 has formed therewith arms 86 extending parallel to bed II and terminating in upturned members 81 having bearing screws 88 mounted therein. Arms 86 also carry bearing blocks 89 having bearing caps .98, a spacer support rod 8| being carried by bearing blocks 89 beneath caps 98 and being centered by screws 88.

Suitably mounted on spacer support rod 9| are a under extension 13 when the cradle. is locked to- Top member 35 is recessed at 83 (Fig.

plurality of spacers 92 designed to slide between i the pairs of forming plates 29 and 36 to suitably space them. Slide 85 is moved on track 84 to move spacers 92 into or out of position between the pairs of forming plates 29 and 36 by a link 93 pivoted to. slide 85 at 94 and pivotally engaging a second link 95 at 96, link 95 being carried by a shaft 96' rotatably mounted in brackets 91 secured to bed I I, shaft 96' being rotated by a manually operable lever 98 or by suitable hydraulic means to be hereafter described engaging an arm 99 likewise secured to shaft 96.

Mounted at the other end of bed II oppositecylinder I6 is a cylinder I88 suitably supported by brackets I8I secured to bed II, the cylinder assembly being held together by bolts I82.

by adjusting screw I03 secured to bed I I. Fluid under pressure is admitted to one side of piston I84 in cylinder I88 through a flexible conduit I85 and to the other side through a flexible conduit I86. Secured to piston I84 is piston rod I81 (Figs. 13, 20 and 21) which passes outward through extension I 88 of bracket I8I, suitable packing being provided at I89 to prevent the escape of liquid from cylinder I88. Piston rod I81 gage over an upwardly extending tongue 5| on is internally bored and threaded at its outer end as at I I8. Suitably mounted on extension I88 of bracket I8| as by threads III is hollow end seal assembly housing I I2 longitudinally slotted at I I3 and I I4 and closed bythe end cap .I I5 which is internally threaded at II6 (Fig. 28). Threaded into boring I I8 of piston rod I81 and locked in place by lock nut I I1 is extension I I8 upon which is mounted collet clamping member II9 secured thereto by through pin I28. Collet clamping member H9 is centrally bored at I 2| and longitudinally slotted at I22. Central boring I2I is enlarged at I23 and is chamfered at-I24.. A stop nut I25 is threaded into the internally threaded portion I I6 of end cap I I5 and surrounds clamping member II9 which slides therein. Carried within the central boring I2| of clamping member H9 is sliding member I26 centrallybored at I21 and bored to receive the transverse pin I28 which itself is bored at I29 and opens into boring I21. A suitable conduit I38 opens into boring I29 as will later be more fully described. Sliding member I26 is recessed at I3I to receive a hollow end plug I32 upon which is threaded the sealing collet I33. Sealing collet I33 is longitudinally slotted at I34 dividing the same into four clamping fingers I35 (Figs. 17 and 18), each finger I35 having a beveled surface I36 to be engaged by and mating with the chamfered portion I24 of clamping member II9. Threaded into hollow end plug I32 and extending past the ends of fingers I35 is hollow male member I31, having ridges at I38 and designed to enter the open end of the tube I39 which is to be formed into the Theposition of the cylinder assembly may be varied expansible and contractible vessel. A spring I40 carried in recess I2I urges sliding member I26 to the right as seen in Fig. 20 to engage the transverse pin I28 with the right-hand end of slots I22 in member II9.

Figs. 22 and 23 disclose a modified form of the end sealing assembly just described. In this form clamping member H9 is formed with an internal circumferential shoulder I4I against which ring member I42 having the chamfered portion I24 is held by lock ring I43. Male member I31 instead of being ridged at I38 has a head I44 designed to enter tube I39 and tube I39 is bent by chamfered surface I24 over the end surface I45-of head I44 as shown in Fig. 23.

With reference now to Figs. 1, 2 and 3 the hydraulic system for operating the above described embodiment of the present invention will now be described. As illustrated, a main supply line I46 leading from a central pumping station supplies water under pressure to a reservoir I41, the rate of supply being controlled by hand-adjusted valve I48. Air is admitted under pressure to reservoir I41 through valve I49 and any suitable gauge I50 is used to indicate the water level in reservoir I41. Reservoir I41 is suitably supported on legs II. A supply line I52 controlled by a hand-adjusted valve I53 takes the water under pressure through a coupling I54 to a suitable four Way valve I55. From one outlet .I56 of four way valve I55 a supply line I51 leads through a T coupling I58 to a T coupling I59. T coupling I59 connects to T coupling I60 on one side and is closed by plug I6I on the other. One side of T coupling I60 is connected to flexible conduit I05 leading to cylinder I00. T coupling I60 connects to T coupling I6I which in turn connects through hand-adjusted valve I62 to T coupling I63 which connects through elbow I64 to the interior of booster cylinder I65.

Referring now more particularly to Fig. 19, booster cylinder I65 is mounted on a bracket I66 secured to bed II, bracket I66 forming end I61 of the booster cylinder I65. A second bracket I66 secured to bed II forms the other end I69 of booster cylinder I65. Mounted in cylinder I65 is piston I to which is secured a piston rod or plunger I1I which extends through end I69, suitable packing I12 and packing nut I13 preventing the escape of fluid from booster cylinder I65. Bolts I14 hold the booster cylinder assembly together. Mounted on end I69 as by threaded sleeve I is high pressure cylinder I16 closed at its upper end by a cap I11.

Openin into high pressure cylinder I16 is T coupling I18. One side of T coupling I18 leads through check valve I19 and hand-adjusted valve I80 (Figs. 1 and 3) to a source of supply of water I8I such as a suitable city water main. The other side of T coupling I18 leads through check valve I82 to a pressure actuated valve I83,

. the pressure responsive element I84 or which connects through conduit I85 with elbow I64. Pressure actuated valve I83 is connected by a conduit with a suitable pressure relief valve I86 which in turn is connected through flexible conduit I81 with conduit I30, a pressure gauge I88 being interposed in conduit I61. Pressure relief valve I86 exhausts through conduit I89 into a T coupling I90. One side of T coupling I90 connects with a hand-adjusted relief valve I9I opening into the exhaust line I92. The other side of T coupling I90 connects with T coupling I93 one side of which connects through conduit I94 with the pressure responsive element I96 of the pressure responsive valve I96. The other side of T coupling I93 connects with T coupling I91 one side of which connects through conduit I98 with the pressure responsive element I99 of pressure responsive valve 200. The other side of T coupling I91 connects with pressure responsive valve 200 which exhausts through conduit I.

Pressure responsive valve I96 connects through hand adjusted valve 202 with T coupling I6I in the supply line I51 and on the other side connects with spacer withdrawing cylinder 203 through conduit 204, cylinder 203 having a plunger 205 designed to engage arm 99 of the spacer withdrawing assembly. Pressure responsive valve I96 is provided with a by-pass 206 in which is connected a check valve 201.

From T coupling I58 in supply line I51 a conduit 208 leads to a valve 209 and from valve 209 a conduit 2I0 leads through valve I8 to one side of cylinder I 6. Valve 209 is mounted on a bracket 2 (Fig. 6) secured to bed II and is actuated by a plunger 2I2 which is engaged by a cam 2I3 which in turn is engaged by one arm 86 of slide 85 when in retracted position.

From the second outlet 2I4 of four way valve I55 a conduit 2I5 leads through a T coupling 2I6 to a second T coupling 2 I 1 one side of which connects to flexible conduit I06 and the other leads through conduit 2I8 to the upper end of booster cylinder I65 at 2I9. From T coupling 2I6 a conduit 220 leads to valve I9 opening into cylinder l6, valve I9 being provided with a by-pass 22I having a check valve 222 therein.

From the third side 223 of four Way valve I55 a return line 224- leads through a check valve 225 and hand-adjusted valve 226 to a return line 221 to the central pumping station.

Four way valve I55 is controlled by a suitable pilot valve 228 conveniently mounted on bed II and shown more particularly in Fig. '1. Pilot valve 228 comprised a base 229 centrally bored at 230 into which central boring opens conduit 23I leading from the top of four way valve I55, with conduit 232 leading thereto from the bottom of four way valve I55, conduit 233 leading thereto from T coupling I54 in the pressure supply line I52 and an exhaust conduit 234 leading therefrom. Mounted in central boring 230 is valve member 235 designed to open and close communication with the above enumerated conduits as desired. Valve member 235 has a shaft 236 extending through valve cap 231 and carrying valve operating handle 238. Valve handle 238 has a projection 239 engaged by an actuator 240 pivoted to cradle base 23 (Fig. 5) at 24I and having an extended arm 242 designed to be engaged by a plate 243 mounted on cradle, member 34. Actuator 240 is also adapted to be engaged by a finger 244 mounted on a shaft 245 which passes through the end of the cradle and is secured to the pivoted section of end plate 246 for motion therewith (Fig. 3). Also carried by end plate 246 at its non-pivoted section is shaft 241 passing through the end of the cradle and adapted to be engaged by a locking lever 248 to lock the forming plates in their compressed position against the action of springs 45.

One of the hold down bolts 249 of the cradle bed 23 is given a conical shape so that the op erator may, if necessary, by forcing the open end of the tube to be formed into the expansible and contractible vessel over this cone, flare the open end of the tube to receive the malemember I31.

number of expansible and'contractible. vessels formed by the machine. 7

Assuming now that the above described embodiment of the present invention is set up as described, that the various parts thereof are properly adjusted, that fluid under pressure is in the hydraulic system, that the various valves in the system are properly adjusted, that the forming plates are open (as in Fig. 9) and that the spacers are between the forming plates, then to operate this embodiment of the present invention the operator places a suitable metallic tube I39 having one end closed in the semicircular recesses 4I of forming plates 36 with its closed end fitting in the movable section of end plate 246 after flaring the open end of tube I39, if necessary, by forcing the open end of-tube I39 over cone shaped bolt 249. With tube I39 in place as described the operator seizes hand hold 14 of lever 12 and forces lever 12 to the right or in clockwise direction as viewed in Fig. 9. Clockwise rotation of lever 12 rotates plates 36 and cradle members 33 and 34 in a clockwise direction and pin 16 rides upward in slot 15 of lever 12 rotating latch 11 in a clockwise direction until finger 18 engages the top of pin 6I. Thereafter further clockwise movement of lever 12 acting through latch 11 rotates cradle latch member 51 in a counterclockwise direction rotating gear 66 through gear 63 and cranks 61 in a clockwise direction and stretching springs 69. Counterclockwise rotation of cradle latch member 51 acting through shaft 56, links 55 and release rod 54 rotates latches 50 in a counterclockwise direction. Before latches 50 or latch fingers 60 have reached their locked positions the adjacent edges of the pairs of plates 29 and 36 have met' and thereafter clockwise rotation of lever 12 acts to move latches 50 and latch fingers 60 into their locked positions, latches 50 passing over tongues 5| on plates 36 and latch fingers 60 entering recesses 83 in extension 13 of top member'35. As latches 50 and latch fingers 60 reach their locked positions the under edge of extension 13 passes onto shoulder 82 of lever 12 and pivot 16 enters the offset portion of slot, 15 effecting a strong and secure lock of both cradle and forming plates.

As cradle member 34 reaches its locked position plate 243 secured thereto rides over arm 242 and rotates arm 242 in a counterclockwise direction (Fig. 1) about its pivot MI and actuator 240 is moved to the left in Fig. 5 carrying with it extension 239 of pilot valve operating lever 238 and rotating valve shaft 236 and valve member 235 to place pressure conduit 23I in communication with the top of four way valve I55 operating four way valve I55, to place supply conduit I52 in communication with supply conduit I51, and place conduit 2I5 in communication with return conduit 224. Fluid under pressure in conduit I51 passes through flexible connection. I05 to the left side of piston I04 (as seen in Fig. 13) and forces piston I04 and piston rod I01 to the right, the fluid in cylinder I00 at the right of piston I04 exhausting through conduits I06, 2I5 and return conduit 224. Movement of piston rod I01 to the right moves clamp member I I9, spring I40, slide member I26, clamp fingers I35, and male member I31 to the right until transverse pin I28 engages stop nut I25 as in Fig. 21 at which time male member I31 has entered tube I39 and clamp fingers I35 have passed over and surround tube I39. Further movement of piston rod I01 to the right slides clamp member I I9 over sliding member. I26, compressing spring I40, forcing chamfered portion I24 of clamp member H9 I over the mating angles I36 of clamp fingers I35,

- forcing clamp fingers I35 against the surface of tube I39 and compressing tube I39 against male member I31 to form a fluid tight joint therewith, or as in the embodiment shown in Figs. 22 and 23 the chamfered portion I24 bends the end of tube I39 over shoulder I45-of head I44 of male member I31 as in Fig. 23 to form a fluid tight joint therewith;

While fluid under pressure from conduit I51 is operating the tube end sealing means just described, fluid under pressure from conduit I51 has passed through valve I62, where its flow is plunger I1I in cylinder I16, at which time prese sure backs up behind piston I10 and the fluid under this pressure passes through conduit I85. to the pressure responsive element I84 of pressure actuated valve I83 to open valve I83. At this time owing to the adjustment of valve I62 the tube end sealing cycle above described has just been completed. With valve I83 open fluid under high pressure from cylinder I16 passes through pressure relief valve I86, pressure gauge I88, conduit I81, conduit I30 and through boring I21 and male member I31 into tube I39 where the fluid under high pressure acts to form bulges in the tube I39 between the pairs of forming plates 29 and 36 as seen in Fig. 15. As soon as the bulges have been formed in tube I 39 pressure backs up in conduit I81 and pressure relief valve I86 opens and relieves excessive fluid pressure through conduit I89 where the pressure backs up against the closed pressure actuated valve 200, any excess pressure fluid exhausting through valve I9I and conduit I92, valve I9I being suitably adjusted to obtain the proper pressure behind valve 200. The

valve 202 passes to cylinder 203 and raises plunger 205 and rotates arm 99 in a counterclockwise direction as seen in Fig. 6 rotating shaft 96' and link 95 in the same direction, link 95 acting through link 93 to move slide 85 to the left and I withdraw spacers 92 from between the pairs of plates 29 and 36.

As spacers 92 reach their withdrawn position valve 200 opens releasing 'thef pressure in conduit I94'and valve I96close s': 4

Movement of slide to the left in Fig. 6'

moves arm 86 of slide 85 over cam M3 and depresses plunger 2I2 to open valve 209 as soon as spacers 92 reach their withdrawn positioml Opening of valve 209 admits fiuidunder pressure from conduit I51 through conduit 208 to conduit 2") and this fluid under pressure is properly controlled by valve I8 and admitted to cylinder I6, forcing the piston in cylinder I6 to the left in Fig. 1, which in turn forces ram shaft 2I to the left engaging ram head 22 with end plate 246 and thereafter forcing end plate 246 and the pairs of forming plates 29 and 36 to the left against the actions of springs 45 and folding tube I39 into bends which enter the cut away portions '4I' and 42 of: each pair of plates 29 and 36. The fluid in cylinder I6 in front of the piston finds easy egress from cylinder I6, as the piston is moved to the left, through valve I9 and by-pass 22I and check valve 222, by-pass 22I being provided to insure that no substantial resistance will be offeredto the movement of the piston so that the action of ram head 22 will be smooth and uniform.

As end plate 246 moves to the left it carries with it rod 241 which is' then engaged and locked by lever 248 to prevent any expansive movement of the end plate 246 or of the pairs of plates 29 and 36. End plate 246 also carries with it rod 245 and finger 244 and as the pairs of plates 29 and 36 reach a predetermined compacted position finger 244 engages actuator 240 (Fig. 5) and moves 'actuator 240 to the right and rotates pilot valve handle 238 and valve. member 235 to place pressure conduit 233 in communication with conduit 232 leading to the bottom f four way valve I55, which places supply conduit I52 in communication with conduit 2I5 and places conduit I51 in communication with return conduit 224. Fluid under pressure in conduit 2I5 passes through T coupling 2I6 into conduit 220 and through valve I9 into cylinder I6 where it moves the piston to the right in Fig.

1 withdrawing ram shaft 21I and ram head 22 from end plate 246, the fluid on the other side of the piston exhausting through valve I6, conduit 2I0, valve 209, conduit 208, and conduit I51 into the return conduit 224.

Release of pressure in conduit I51 releases pressure in conduit I85 and valve I83 closes. At the same time fluid under pressure in .conduit 2I5 passes through conduit 2I8 into the top of booster cylinder I65 at 2I9 and forces piston I10 downward (Fig. 19) the fluid beneath piston I10 exhausting through conduit I51 into the return conduit 224. As piston I10 moves downward plunger I1I moves downward in cylinder I16 and city water from main I8I suitably controlled by valve I80 opens check valve I19 and fills cylinder I16 for the next cycle of operation.

. Closing of valve I83 allows pressure relief valve I86 to drain the liquid from the pipes leading to the now completed expansible and contractible metallic vessel and lack of pressure in exhaust conduit I89 allows valve 200 to close. Fluid under pressure has meanwhile been supplied from conduit 2I5 through conduit I06 to the right side of cylinder I00 (Fig. 13) forcing piston I04 to the left, fluid to the left of piston I04 exhausting through conduits I05 and I61 to return conduit 224. Motion of piston I 04 to the left moves piston rod I01 to the left, drawing clamp member I I9 to the left, disengaging chamfered surface I24 from mating surfaces I36 and allowing clamping fingers I35 to disengage the surface of the tube end I39 of the now completed expansible and contractible vessel.

Clamp member I I9 continues to move to the left until the right ends of slots I22 engage transverse pin I28 and thereafter sliding member I26 is drawn to the left pullingmale member I31 out of the tube end I39 and the tube end sealing assembly is returned to its initial position.

The operator now grasps hand hold 14 of lever 12 and moves it in a counterclockwise direction as seen in Fig. 12 a small force being sufllcient to start pivot 16 down slot 15 and move shoulder 82 out of engagement with the under surface of extension 13. Thereafter springs 69 rotate cradle latch member 61 in a clockwise direction in Fig. 9, which frees fingers 60 from recess 83,

. frees pin 6| from fingers 18 and 19, rotates latches 60 in ;a clockwise direction, freeing tongues SI and unlocking each pair of plates 29 and 36. and rotates cranks 61 through gears 63 and 66 in a counterclockwise direction releasing the tension in springs 69. Further counterclockwise movement of lever 12 rotates cradle members 33 and 34 and plates 36 in a counterclockwise direction (Figs. 8 and 9) separating each pair of plates and the operator then removes the finished expansible and contractible vessel. The operator now depresses locking lever 246 disengaging rod 241 and allowing springs 45 to force the pairs of plates 29 and 36 apart and to return the pairs of plates t their initial positions where they are stopped by the stop sleeves 30, 32 and 38 before referred to.

The pairs of plates 29 and 36 being now in their expanded and initial positions the operator grasps lever 98 and rotates it in a clockwise direction (Fig. 6) which rotates shaft 96', link 95 and arm 99 in a clockwise direction, link 95 acting through link 93 to move slide 85 to the right, closing valve 209 and inserting spacers 92 between the pairs of plates 29 and 36, arm 99 depressing plunger 205 and forcing the fluid out of cylinder 203 through check valve 201 and bypass 206, valve I96 then being closed, through conduit I51 into the return conduit 224 and thereafter the operator manually rotates pilot valve 235 to its neutral or initial position using lever 238.

The apparatus of the present invention just described is now in position to commence another cycle of operation upon the proper insertion of the tube and the closing of the cradle as described above.

As will be apparent, adjustment of the handoperated valves heretofore referred to enables the rate of flow therepast and the development of pressure therebeyond to be nicely predetermined so that the desired intervals of time will transpire between the successive operations in the sequence described, and where pressure responsive valves are used proper selection of the actuating pressure as well understood in the art will effect a like result.

It will now be apparent that the present invention provides a novel hydraulic press for forming expansible and contractible corrugated eral pairs of forming plates before thestart of the forming cycle, it also being apparent that the present invention provides'novel means for locking the forming plates of each pair together and novel means for carrying the forming plates to allow their ready removal.

To those skilled in the art changes in or modifications of the above described illustrative embodiment of the present invention will now be suggested without departing from the inventive concept of the present invention. For instance if metallic tubes having both ends open are to be formed into the expansible and contractible corrugated metallic vessel then instead of using an end plate 246, as described, a second end sealing assembly would be used and properly timed in the cycle to close the end of the tube before hydraulic pressure was admitted at the other end of the tube or both end sealing devices could be timed to operate together and to both admit hydraulic pressure to the tube at the same time. In such a situation as this the second end sealing assembly, with proper pressure booster means, as described,

would be mounted on ram shaft 2| in place of ram head 22 and would have the dual function of both end sealing the tube and compressing the forming plates to form the expansible and contractible metallic vessel. Further and other changes in the hydraulic system, in the spacer assembly or in the various locking devices will now be suggested, and therefore to determine the scope of the present invention reference should be had to the appended claims.

What is claimed is:

1. .In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted,

a source of hydraulic pressure, means for locking the plates of said pairs together, and means for automatically closing the open end of a tube supported in said plates when said plates are ing plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, means for sealing the open end of a tube supported in said plates when said plates are in locked position, said sealing means providing a conduit comhydraulic pressure for increasing the pressure.

thereof to a bulging pressure, and means actuated by said second named frame to operate pressure with said means for providing a bulging pressure, said means for developing bulging pressure communicating with the interior of said tube through said end sealing means.

3. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, means for sealing the open end of a tube supported in said plates when said plates are in locked position, said sealing means providing a conduit communicating with the interior of said tube, a valve, means in communication with said source of hydraulic pressure for increasing the pressure thereof to a bulging pressure, means actuated by said second named frame to operate said valve and connect said source of hydraulic pressure said valve and connect said source of hydraulic with said means for providing a bulging pressure,

and means for connecting said means for developing bulging pressure through said tube end sealing means to the interior of the tube only after said sealing means seals the end of the tube.

4. In an apparatus of the character described,

- in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, means for sealing the open end of a tube supported in said plates when said plates are in locked position, a valve, a pressure booster adapted to be connected to the interior of said tube through said sealing means, a pressure relief valve between said pressure booster and said sealing means, and means actuated by said second named frame for automatically operating said first named valve to connect said source of hydraulic pressure to said pressure booster as said plates are locked together, said pressure booster communieating with the interior of said tube through said sealing means and said pressure relief valve operating to maintain a substantially uniform pressure in the tube while bulges are being formed in said tube between said plates.

5. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, spacers adapted to be inserted between the respective pairs of plates, means for sealing the open end of a tube supported in said plates when said plates are locked together, a cylinder and piston for withdrawing said spacers, means actuated by said second named frame as said-plates are locked together for connecting said source of hydraulic pressure with the interior of said tube to bulge said tube between said plates, and means automatically connecting said source of hydraulic pressure with said cylinder to actuate said piston and withdraw said spacers from between said plates after bulging pressure has been established in said tube.

6. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, spacers adapted to be inserted between the respective pairs of plates, a cylinder and piston, means actuated by said piston for sealingthe open end of a tube supported in said plates when said plates are locked together, a second cylinder and piston for operating said spacers, a valve, means actuated by said second named framefor operating said valve to connect said source of hydraulic pressure with said first named cylinderto move said piston and bring said sealing means into sealing position, means for thereafter connecting said source of hydraulic pressure with the interior of said tube to bulge said tube between said plates, and means for connecting said source of hydraulic pressure with said second named cylinder to withdraw said spacers after said bulge forming pressure has been established in said tube.

7. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which, the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, spacers adapted to be inserted between the respective pairs of plates, a cylinder and 'piston, means actuated by said piston for sealing the open end of a tube supported in said plates when said plates are locked together, a second cylinder and piston for operating said spacers, a valve, means actuated by said second named frame for operating said valve to connect said source of hydraulic pressure with said first named cylinder to move said piston and bring said sealing means into sealing position, means for thereafter connecting said source of hydraulic pressure with the interior of said tube to bulge said tube between said plates, means for connecting said source of hydraulic pressure with said second named cylinder to withdraw said spacers after said bulge forming pressure has been established in said tube, a ram for moving said plates axially, a piston and cylinder for operating said ram, and means actuated by the withdrawal of said spacers for connecting said source of hydraulic pressure with said last named cylinder.

8. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, spacers adapted to be inserted between the respective pairs of plates, means for sealing the open end of a tube supported in said plates when said plates are locked together, a cylinder and piston for withdrawing said spacers, a ram for moving said plates axially, a cylinder and piston for operating said ram, means actuated by said second named frame as said plates are locked together for connecting said source of hydraulic pressure with the interior of said tube to bulge said tube between said plates, means connecting said source of hydraulic pressure with said firstjnamed cylinder to withdraw said spacers only after bulge forming pressure has been established in said tube, and means actuated by the withdrawal of said spacers for connecting said source of hydraulic pressure with said second named cylinder to move said ram and displace said plates axially.

9. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source oil hydraulic pressure, means for locking the plates of said pairs together, spacers adapted to be inserted between the respective pairs of plates, means for sealing the open end of a tube supported in said plates when said plates are locked together, a cylinder and piston for withdrawing said spacers, a ram for moving said plates axially, a cylinder and piston for operating said ram, means actuated by said second named frame as said plates are locked together for connecting said source of hydraulic pressure with the interior of said tube to bulge said tube between said plates, means connecting said source of hydraulic pressure with said first named cylinder to withdraw said spacers only after bulge forming pressure has been established in said tube, means actuated by the withdrawal of said spacers for connecting said source of hydraulic pressure with said second named cylinder to move said ram and displace said plates' axially, and means actuated by the axial movement of said plates to reverse the direction of movement of said ram when said plates reach a predetermined position.

10. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for looking the plates of said pairs together, means for sealing the open end of a tube supported in said plates when said plates are in locked position, and means operable by said hydraulic pressure for admitting hydraulic pressure to the interior of said tube to form bulges therein operable and only after said sealing means is in sealing position.

11. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other, corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, means for sealing the open end of a tube supported in said plates when said plates are in locked position, and means actuated by the movement of said second named frame for hydraulically operating said sealing means to move the same into sealing position.

12. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates responding plates of said pairs are slidably of said pairs are slidably mounted, apivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, means for sealing the open end of a tube supported in said forming plates when said plates are locked together, spacers adapted to be inserted between the respective pairs of plates, means for admitting hydraulic pressure to the interior of said tube to form bulges in said tube, and means for automatically removing said spacers from between said plates operative only after bulge forming pressure has been established in said tube.

13. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted,

a source of hydraulic pressure, means for looking the plates of said pairs together, means for sealing the open end of a tube supported in said.

plates when said plates are locked together, spacers adapted .to be inserted between the respective pairs of plates, means for admitting hydraulic pressure to the interior of said tube to form bulges in said tube, automatic means for withdrawing said spacers operative only after bulge forming pressure has been established in said tube, and hydraulic means actuated automatically by the withdrawal of said spacers for moving said plates axially to 'form corrugations in the bulged tube.

14. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other cormounted, a source of hydraulic pressure, means for locking the plates of said pairs together, means for sealing the open end of a tube supported in said plates when said plates are locked together, hydraulic means automatically actuated when said sealing means are in sealing position to form bulges in said tube, and hydraulic means automatically actuated only after bulges have been formed in said tube for moving said plates axially to form corrugations in the bulged tube.

15. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for looking the plates of said pairs together, means for sealing the open end of a tube supported in said plates when said plates are locked together, hy-

draulic means automatically actuated when said sealing'rneans are in sealing position to form bulges in said tube, hydraulic means automatically actuated only after bulges have been formed in said tube for moving said plates axially to form corrugations in the bulged tube, and means actuated by said plates for reversing the operation of said last named means when said plates have reached a predetermined position.

16. In an apparatus of the character described,

I in combination with pairs of cooperating, forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, means for sealing the open end of a tube supported in said plates when said plates are locked together, means connected to said source of hydraulic pressure for increasing said pressure to a bulge forming pressure and then admitting said bulge forming pressure to the interior of said tube when said sealing means are in sealing position, hy-

draulic means for moving said plates axially to form corrugations in the bulged tube, and means to initiate operationof said last named means only after bulge forming pressure has been established in said tube.

17. Inan apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mountedya source of hydraulic pressure, means for locking the plates of said pairs together,- means for sealing the open end of a tube supported in said plates when said plates are in locked position, spacers adapted to be inserted between the respective pairs-of plates, means connected to said source of hydraulic pressure for increasing said pressure to a bulge forming pressure and then admitting said bulge forming pressure to the interior of said tube, means actuated automatically when a bulge forming pressure has been established in said tube for withdrawing said spacers, and means actuated by the withdrawal of said spacers for moving said plates axially to form corrugations in the bulged tube.

18. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a

source of hydraulic pressure, means for looking the plates of said pairs together, means for sealing the end of a tube supported in said plates when said plates are in locked position including a cylinder and piston, a headed member carried by said piston for insertion in the end of the tube, and means actuated by said piston and sliding over said headed member after insertion in the end of the tube for gripping said tube end against said headed member.

19. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, means for sealing the open end of a tube supported in said plates when said plates are locked together, and means connected to said source of hydraulic pressure for increasing said pressure to a bulge forming pressure and then introducing said bulge forming pressure into the interior of said tube including a cylinder and a piston, a second piston of smaller area than said first named piston and actuated thereby, a cylinder for said second named piston adapted to be placed in communication with said tube, means actuated by said second named frame as it is moved into locked. position to connect said source .of hydraulic pressure with said first named cylinder,

and means actuated by the pressure developed in said first named cylinder for admitting bulge forming pressure from said second named cylinder to the interior of said tube.

20. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, means for sealing the open end of a tube supported in said plates when said plates are in locked position, and means for introducing hydraulic pressure to the interior of said tube to form bulges therein actuated by said second named frame as the same is moved into plate locking position.

21. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together including a lock for each pair of forming plates, a lock mounted on said first named frame and adapted to engage said second named frame, means transmitting the movement of said frame lock to said plate locks, and means carried by said second named frame for actuating said frame lock when the plates of said pairs are moved into cooperative relationship.

22. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means actuated by said second named frame for locking the plates of said pairs together, means for sealing the end of a tube supported in-said plates when they are locked together, means connected to said source of hydraulic pressure for increasing said pressure to a bulge forming pressure and then admitting said bulge forming pressure to the interior of said tube, means for moving said plates axially to form corrugations in the bulged tube, and hydraulic means actuated by said second named frame as it moves into plate locking position for effecting sequential operation of said sealing means, said pressure admitting means and said plate moving means.

23. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means actuated by said second named frame for locking the plates of said pairs together, means for sealing the end of a tube supported in said plates when they are locked together, means connected to said source of hydraulic pressure for increasing said pressure to a bulge forming pressure and then admitting saidbulge forming pressure to the interior of said tube, and hydraulic means actuated by said second named frame asit moves into plate locking position for effecting sequential operation of said sealing means and said pressure admitting means.

24.'In an apparatus of the character described,

in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure,- means actuated by said second named frame for locking the plates of said pairs together, means for sealing the end of a tube supported in said plates when they are locked together, means connected to said source of hydraulic pressure for increasing said pressure to a bulge forming pressure and then admitting said bulging pressure to the interior of said tube, means for withdrawing said spacers, means for moving said plates axially to form corrugations in the bulged tube, and hydraulic means actuated by said second named frame as it is moved into plate locking position for effecting sequential operation of said sealing means, said pressure admitting means, said spacer withdrawing means, and said plate moving means.

25. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means actuated by said second named frame for locking the plates of said pairs together, means for sealing the end of a tube supported in said plates when they are locked together, means connected to said source of hydraulic pressure for increasing said pressure to a bulge forming pressure and then admitting said bulging pressure to the-interior of said tube, means for withdrawing said spacers, means for moving said plates axially to form corrugations in the bulged tube, and hydraulic means actuated by said second named frame as it is moved into plate locking position for e.- fecting sequential operation of said pressure admitting means, said spacer withdrawing means,

i and said plate moving means.

26. In an apparatus of the character described, in combination with-pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means actuated by said second named plates for locking the plates of said pairs together, means for sealing the end of a tube supported in said plates when said plates are locked tobether, means connected to said source of hydraulic pressure for increasing said pressure to a bulge forming pressure and then admitting said bulging pressure to the interior of said tube, spacers adapted to be inserted between said plates, means for withdrawing said spacers, means for moving said plates axially to form corrugations in the bulged tube, hydraulic means actuated by said second named frame as it is moved into plate locking position for effecting the sequential operation of said sealing means, said pressure admitting means, said spacer removing means, and said plate moving means, and means movable with said plates for actuating said last-named means to withdraw said plate moving means, release said pressure in said tube and withdraw said end sealing means.

2'1. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably mounted, a source of hydraulic pressure, means actuated by said second named plates for lockingthe plates of said pairs together, means for sealing the end hydraulic means actuated by said second named 5 frame as it is moved into plate locking position for eflecting the sequential operation of said sealing means, said pressure admitting means, and said plate moving means, and means movable with said plates for actuating said lastnamed means to withdraw said plate moving means, release said pressure in said tube and withdraw said end sealing means.

28. In an apparatus of the character described, in combination with pairs of cooperating forming plates, a frame on which corresponding plates of said pairs are slidably mounted, a pivotally mounted frame on whichthe other correspondtube.

ing plates of said pairs are slidably mounted, a source of hydraulic pressure, means for locking the plates of said pairs together, means for sealing the open eid of a tube supported in said plates when said plates are in locked position, means for increasing said pressure to a bulging pressure, and means automatically actuated by said last named means for admitting said pressure to the interior of the tube only when the bulging pressure has been developed by said last named means. v

29. In an apparatus of the character described.

in combination with pairs of cooperating i'orming plates, 9. drama on which corresponding plates 01' said pairs are slidably mounted, a pivotally mounted frame on which the other corresponding plates of said pairs are slidably locked position, and means actuated by the movement of said second named frame for increasing said pressure to a bulging pressure and then admitting said pressure to the interior of the JEAN v. omsma. 

